You can put this solution on YOUR website! x + y = 66
x - y = 32 add y on both sides and you get:
x = 32 + y now substitute for x in the first equation:
x + y = 66
32 + y + y = 66
2y = 34
y = 17
and
x - y = 32
x - 17 = 32
x = 49
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Check:
x + y = 66
49 + 17 = 66 Correct